Lacy Faddoul and Marcus Grodd
Lacy Faddoul and Marcus GroddInstagram/Screenshot

"Bachelor in Paradise" stars Marcus Grodd and Lacy Faddoul, who got engaged on the show, are said to be busy planning their wedding, amidst allegations that he cheated on her with another reality show star.

Soon after Grodd proposed to Faddoul, he started dating Sydney Rae James, In Touch reported, adding that the 23-year-old star of E!''s "Eric & Jessie: Game On," went out with Grodd as she thought his romance with Faddoul was over.

"They went on a date and kissed," and insider said. "Sydney thought his romance with Lacy was over. He was all over her. Meanwhile, poor Lacy has been planning their wedding this whole time. If she knew about Sydney, she'd flip."

Grodd and Faddoul got engaged in June, but they had to wait till the finale of "The Bachelor in Paradise" aired on 8 September to make their romance public. And it was in these three months that Grodd allegedly got together with James.

The two haven't reacted to the cheating allegation, but from the looks of it, they are still going strong, and busy planning their wedding.

"It was difficult," Faddoul told an ABC affiliate about staying apart the three months. "We sent cards back and forth and he sent me lots of bridal magazines and we saw each other every two weeks until now," she said, according to Wetpaint.

For his part, Marcus said that one of the difficult things to do was keeping his love for Faddoul a secret. "It's a little hard keeping it a secret but I guess ABC taught me real well and I kept a good poker face."

Recently, Faddoul uploaded on Instagram a picture of the couple hanging out together, and from the looks of it, the nursing home owner from San Diego is relocating to Dallas to be near Grodd full-time.

"My loves and I watching the season finale of #bachelorinparadise #texas #abc #shitzu," Faddoul captioned the photograph., showing that they are still together despite cheating allegations.

Grodd was a popular contestant on Andi Dorfman's season of "The Bachelorette," and Faddoul made her television appearance through Juan Pablo Galavis' season of "The Bachelor."